When the flow output does not change, this can be due to a faulty Mode Door Actuator. The Actuator is located behind the center of the dash, mounted to the lower section of the HVAC housing. If you have a center console, this will need to be removed to gain access. Inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, remove the actuator and turn the door pin by hand. The output flow should now change levels. If not, then the problem will be the mode door internal of the housing. The housing will need to be removed and repaired as needed. If the flow is correct, replace the Mode Door Actuator. For an image view of the locations, click here: https://www.dropbox.com/s/qkacl5e3fgof7qa/mactuator.jpg?dl=0

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Hi George. I noticed this thread was still open and wanted to check-in and see how you made out? Was the actuator the problem? Were there any other questions you had on this issue? Did you need repair manual procedures?